Ticket #41623: 41623.0.diff

src/wp-admin/js/customize-widgets.js

@@ -602 +602 @@
                         $customizeSidebar = $( '.wp-full-overlay-sidebar-content:first' );
                         this.container.addClass( 'wide-widget-control' );
 
-                        this.container.find( '.widget-content:first' ).css( {
+                        this.container.find( '.form:first' ).css( {
                                 'max-width': this.params.width,
                                 'min-height': this.params.height
                         } );